Vulnerability · Published Sep 16, 2026 · Assigned by VulnCheck
CVE-2026-92596Nodemailer before 9.1.0 Denial of Service via addressparser
High 7.5
In plain English
A high-severity uncontrolled resource consumption in nodemailer from nodemailer. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 58% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Nodemailer before 9.1.0 contains a quadratic time complexity vulnerability in the addressparser component that allows remote attackers to cause denial of service by supplying a crafted comma-separated address list. Attackers can send a single email with a large number of addresses to block the Node.js event loop for extended periods, consuming 100% CPU and freezing the process.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | node-nodemailer | no fix listed | DEBIAN-CVE-2026-92596 |
| Debian:13 | node-nodemailer | no fix listed | DEBIAN-CVE-2026-92596 |
| Debian:14 | node-nodemailer | 10.0.0+~8.0.1-1 | DEBIAN-CVE-2026-92596 |
| Ubuntu:22.04:LTS | node-nodemailer | no fix listed | UBUNTU-CVE-2026-92596 |
| Ubuntu:24.04:LTS | node-nodemailer | no fix listed | UBUNTU-CVE-2026-92596 |
| Ubuntu:26.04:LTS | node-nodemailer | no fix listed | UBUNTU-CVE-2026-92596 |
| Ubuntu:26.10 | node-nodemailer | no fix listed | UBUNTU-CVE-2026-92596 |
| npm | nodemailer | 9.1.0 | GHSA-2x7j-588g-ccc2 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| nodemailer | nodemailer | 0 – before 9.1.0 |
Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- GitHub Security Advisory (GHSA-2x7j-588g-ccc2) vendor-advisory
- Patch Commit patch
- Patch Commit patch
- Patch Commit patch
- Patch Commit patch
- VulnCheck Advisory: Nodemailer before 9.1.0 Denial of Service via addressparser third-party-advisory